What would your ideal MMOG be like?

obviously a good storyline, that gets you to fight challenging bosses, but as for how the character playability is/should be, my best way of describing it would be "like devil may cry 4" dragon nest's battle system is a good example, B&S looks like this too, have bosses that put a challenge on the whole party. and that require SKILL to beat, rather than spam, with interactive rooms (for example, a spider boss that you have to fight on the ceiling and walls, and having to manage your controller while fighting)

inventive stuff

skillbuilding, as said, that there's not "one set path", in fact, have certain paths excel supportively at certain dungeons for every class. each dungeon offering balanced rewards in comparison to the others